CN104852593A - Phase shift type high-frequency transformation demodulation system based on capacitance feedback three-point type oscillation circuit - Google Patents

Phase shift type high-frequency transformation demodulation system based on capacitance feedback three-point type oscillation circuit Download PDF

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Publication number
CN104852593A
CN104852593A CN201510307192.5A CN201510307192A CN104852593A CN 104852593 A CN104852593 A CN 104852593A CN 201510307192 A CN201510307192 A CN 201510307192A CN 104852593 A CN104852593 A CN 104852593A
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triode
circuit
resistance
phase shift
polar capacitor
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周云扬
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Chengdu Co Ltd Of Hat Shenzhen Science And Technology
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Chengdu Co Ltd Of Hat Shenzhen Science And Technology
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Priority to CN201410692727.0A priority Critical patent/CN104407379A/en
Priority to CN2014106927270 priority
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Priority to CN201510307192.5A priority patent/CN104852593A/en
Publication of CN104852593A publication Critical patent/CN104852593A/en
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Abstract

The invention discloses a phase shift type high-frequency transformation demodulation system based on a capacitance feedback three-point type oscillation circuit. The system is composed of a transformer T1, a transformer T2, a sampling circuit, a voltage comparison circuit connected with the sampling circuit, a frequency mixing circuit connected with the secondary winding of the transformer T1, a first conversion circuit connected with the frequency mixing circuit, a processing circuit simultaneously connected with the frequency mixing circuit and the first conversion circuit, a second conversion circuit connected with the output end of the processing circuit, and a phase shift processing circuit simultaneously connected with the dotted terminal of the secondary winding of the transformer T1 and the processing circuit, wherein the primary winding of the transformer T2 is connected with the second conversion circuit and the primary winding of the transformer T1 is connected with the voltage comparison circuit. The system is characterized in that the capacitance feedback three-point type oscillation circuit is also connected in series between the sampling circuit and the phase shift circuit. According to the invention, the capacitance feedback three-point type oscillation circuit is arranged in the system, the frequency can be more stable, and the precision can be improved.

Description

Based on the phase shift high frequency conversion demodulation system of capacitive feedback bikini oscillating circuit
Technical field
The present invention relates to a kind of demodulation system, specifically refer to the phase shift high frequency conversion demodulation system based on capacitive feedback bikini oscillating circuit.
Background technology
Wave detector can detect certain useful information in fluctuation signal, and it is for identifying the device that ripple, oscillator signal exist or change, and also can be used for extracting the information entrained by the external world.Current wave detector is widely used, and the noise etc. as can be used for geological prospecting and engineering survey, when running for measurement equipment, has brought very large facility.But its frequency stability of wave detector is on the market not high at present, thus have a strong impact on the accuracy of exploration result.
Summary of the invention
The object of the invention is to overcome the not high defect of its frequency stability of existing wave detector, a kind of phase shift high frequency conversion demodulation system based on capacitive feedback bikini oscillating circuit is provided.
Object of the present invention is achieved through the following technical solutions: based on the phase shift high frequency conversion demodulation system of capacitive feedback bikini oscillating circuit, it is by transformer T1, transformer T2, sample circuit, be connected with sample circuit voltage comparator circuit, the mixting circuit be connected with transformer T1 secondary, the first change-over circuit be connected with mixting circuit, the treatment circuit be simultaneously connected with the first change-over circuit with mixting circuit, the second change-over circuit be connected with treatment circuit output, the phase shift treatment circuit be simultaneously connected with Same Name of Ends and the treatment circuit of transformer T1 secondary, and be serially connected in the composition of the capacitive feedback bikini oscillating circuit between sample circuit and phase-shift circuit.The former limit of described transformer T2 is connected with the second change-over circuit, and the former limit of transformer T1 is connected with voltage comparator circuit.
Further, described capacitive feedback bikini oscillating circuit is by triode Q6, triode Q7, N pole is connected with the collector electrode of triode Q6, the diode D3 that P pole is then connected with sample circuit, one end is connected with the P pole of diode D3, the resistance R18 that the other end is then connected with the base stage of triode Q6, positive pole is connected with the collector electrode of triode Q7 after oscillator X, the polar capacitor C12 of minus earth, one end is connected with the emitter of triode Q6, the resistance R19 that the other end is then connected with the negative pole of polar capacitor C12 after resistance R20, positive pole is connected with the emitter of triode Q6, the polar capacitor C13 that negative pole is then connected with the collector electrode of triode Q7, the controllable impedance L2 be in parallel with polar capacitor C13, N pole is connected with the emitter of triode Q6, the diode D4 that P pole is then connected with the negative pole of polar capacitor C12 after resistance R21, and positive pole is connected with the emitter of triode Q7, the polar capacitor C14 that negative pole is then connected with the negative pole of polar capacitor C12 forms, connect 15V voltage while the emitter of described triode Q6 is connected with phase-shift circuit, its collector electrode is then connected with the tie point of resistance R20 with resistance R19, the base stage of described triode Q7 is then connected with the collector electrode of triode Q6, its emitter is then connected with the P pole of diode D4.
Described phase shift treatment circuit is by phase shift chip U2, triode Q4, triode Q5, one end is connected with the VCC+ pin of phase shift chip U2, the resistance R16 that the other end is connected with the IN1 pin of phase shift chip U2, negative pole is connected with the IN1 pin of phase shift chip U2 after resistance R17, the polar capacitor C11 that positive pole is connected with the IN2 pin of phase shift chip U2, positive pole is connected with the NC pin of phase shift chip U2 after resistance R14, the polar capacitor C9 that negative pole is connected with the collector electrode of triode Q4, positive pole is connected with the OUT pin of phase shift chip U2, the polar capacitor C10 of minus earth, one end is connected with the OUT pin of phase shift chip U2, the potentiometer R15 that the other end is connected with treatment circuit, P pole is connected with the OFF1 pin of phase shift chip U2, the diode D1 that N pole is connected with the base stage of triode Q4, and P pole is connected with the OFF2 pin of phase shift chip U2, the diode D2 that N pole is connected with the emitter of triode Q5 forms, the VCC+ pin of described phase shift chip U2 is connected with the Same Name of Ends of transformer T1 secondary, its VCC-pin ground connection, its OUT pin are connected with the sliding end of potentiometer R15, the emitter of triode Q4 is connected with the base stage of triode Q5, and the collector electrode of triode Q5 is then connected with the second change-over circuit, the negative pole of described polar capacitor C11 is also connected with the emitter of triode Q6.
Described sample circuit is by amplifier P, one end is connected with the normal phase input end of amplifier P, the other end is as the resistance R1 of signal input part, the polar capacitor C1 that positive pole is connected with the normal phase input end of amplifier P, negative pole is then connected with the P pole of diode D3, the resistance R2 be in parallel with polar capacitor C1, be serially connected in the resistance R4 between the inverting input of amplifier P and output, and one end is connected with the inverting input of amplifier P, the resistance R3 of other end ground connection forms; The output stage of described amplifier P is also connected with voltage comparator circuit.
Described voltage comparator circuit is by comparable chip U1, the resistance R6 that one end is connected with the IN2 pin of comparable chip U1, the other end is connected with the V+ pin of comparable chip U1, the resistance R7 that IN2 pin is connected, the other end is then connected with mixting circuit of one end and comparable chip U1, the resistance R5 that one end is connected with the output of amplifier P, the other end is then connected with the IN1 pin of comparable chip U1, and the polar capacitor C2 that positive pole is connected with the V-pin of comparable chip U1, negative pole is connected with the GND pin of comparable chip U1 forms; The V+ pin of described comparable chip U1 connects 15V voltage, and its OUT pin is connected with non-same polarity with the Same Name of Ends on the former limit of transformer T1 simultaneously, GND pin ground connection.
Described mixting circuit is by dual-gate field-effect pipe K, resistance R8, resistance R13, and inductance L 1 forms; One end of resistance R8 is connected with a grid of dual-gate field-effect pipe K, the other end is connected with the IN2 pin of comparable chip U1 after resistance R7, the drain electrode that one end of inductance L 1 is connected with the drain electrode of field effect transistor K, the other end gets back to field effect transistor K after resistance R13; The tie point of described resistance R13 and inductance L 1 is connected with the first change-over circuit with treatment circuit simultaneously, the b grid of field effect transistor K is connected with transformer T1 secondary non-same polarity, drain be connected with treatment circuit, source electrode is connected with the first change-over circuit.
The first described change-over circuit is by triode Q1, the resistance R9 that one end is connected with the emitter of triode Q1, the other end is connected with the source electrode of dual-gate field-effect pipe K, the polar capacitor C3 be in parallel with resistance R9, the polar capacitor C4 that negative pole is connected with the tie point of inductance L 1 with resistance R13, positive pole is connected with the collector electrode of triode Q1 forms; The base stage of described triode Q1 is connected with the non-same polarity on the former limit of transformer T1, and its emitter is connected with treatment circuit; The emitter of described triode Q1 is also connected with the OUT pin of phase shift chip U2 after potentiometer R15.
Described treatment circuit is by triode Q2, triode Q3, the resistance R10 that one end is connected with the base stage of triode Q3, the other end is connected with the emitter of triode Q1, the resistance R11 that one end is connected with the emitter of triode Q3, the other end is connected with emitter and second change-over circuit of triode Q1 simultaneously forms; The base stage of described triode Q3 is connected with the emitter of triode Q2, its collector electrode is connected with the Same Name of Ends on the former limit of transformer T2, emitter is connected with the second change-over circuit, and the base stage of triode Q2 is connected with the tie point of inductance L 1 with resistance R13, its collector electrode is connected with the drain electrode of field effect transistor K and the second change-over circuit simultaneously.
The second described change-over circuit comprises polar capacitor C8, polar capacitor C7, polar capacitor C6, polar capacitor C5, resistance R12, the positive pole of polar capacitor C8 is connected with transformer T2 former limit Same Name of Ends, its negative pole is connected with the collector electrode of triode Q2, the positive pole of polar capacitor C7 is connected with non-same polarity with the Same Name of Ends on the former limit of transformer T2 respectively with negative pole, the positive pole of polar capacitor C6 is connected with the emitter of triode Q3, negative pole is connected with the non-same polarity on the former limit of transformer T2, the positive pole of polar capacitor C5 is connected with the emitter of triode Q1, its negative pole is then connected with the negative pole of polar capacitor C6 after resistance R12, the negative pole of polar capacitor C5 is also connected with the collector electrode of triode Q5.Described transformer T2 secondary Same Name of Ends ground connection, non-same polarity are as signal output part.
In order to ensure result of use, described comparable chip U1 is preferably LM311 integrated chip, and U2 is excellent for phase shift chip, preferably elects LM741 integrated chip as.
The present invention comparatively prior art compares, and has the following advantages and beneficial effect:
(1) the present invention adopts phase shift treatment circuit, and it makes demodulation system more stable when processing high-frequency signal, avoids distorted signals.
(2) the present invention is provided with capacitive feedback bikini oscillating circuit, and it can make frequency more stable, thus can improve precision of the present invention.
(3) cost of the present invention is low, meets ideas of energy-saving.
Accompanying drawing explanation
Fig. 1 is overall structure schematic diagram of the present invention.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited to this.
Embodiment
As shown in Figure 1, of the present invention by transformer T1, transformer T2, sample circuit, be connected with sample circuit voltage comparator circuit, the mixting circuit be connected with transformer T1 secondary, the first change-over circuit be connected with mixting circuit, the treatment circuit be simultaneously connected with the first change-over circuit with mixting circuit, the second change-over circuit be connected with treatment circuit output, the phase shift treatment circuit be simultaneously connected with Same Name of Ends and the treatment circuit of transformer T1 secondary, and be serially connected in the composition of the capacitive feedback bikini oscillating circuit between sample circuit and phase-shift circuit.The former limit of described transformer T2 is connected with the second change-over circuit, and the former limit of transformer T1 is connected with voltage comparator circuit.
Wherein, phase shift treatment circuit is by phase shift chip U2, triode Q4, triode Q5, one end is connected with the VCC+ pin of phase shift chip U2, the resistance R16 that the other end is connected with the IN1 pin of phase shift chip U2, negative pole is connected with the IN1 pin of phase shift chip U2 after resistance R17, the polar capacitor C11 that positive pole is connected with the IN2 pin of phase shift chip U2, positive pole is connected with the NC pin of phase shift chip U2 after resistance R14, the polar capacitor C9 that negative pole is connected with the collector electrode of triode Q4, positive pole is connected with the OUT pin of phase shift chip U2, the polar capacitor C10 of minus earth, one end is connected with the OUT pin of phase shift chip U2, the potentiometer R15 that the other end is connected with treatment circuit, P pole is connected with the OFF1 pin of phase shift chip U2, the diode D1 that N pole is connected with the base stage of triode Q4, and P pole is connected with the OFF2 pin of phase shift chip U2, the diode D2 that N pole is connected with the emitter of triode Q5 forms, the VCC+ pin of described phase shift chip U2 is connected with the Same Name of Ends of transformer T1 secondary, VCC-pin ground connection, OUT pin are connected with the sliding end of potentiometer R15, the emitter of triode Q4 is connected with the base stage of triode Q5, and the collector electrode of triode Q5 is connected with the second change-over circuit.Meanwhile, the negative pole of this polar capacitor C11 is also connected with capacitive feedback bikini oscillating circuit.This phase shift treatment circuit, can making demodulation system more stable when processing high-frequency signal, avoiding distorted signals.In order to ensure implementation result, described phase shift chip U2 is preferably LM741 integrated chip, and it is highly sensitive, cheap.
Sample circuit to be collected after outside signal Signal transmissions to voltage comparator circuit.It is by amplifier P, one end is connected with the normal phase input end of amplifier P, the other end is as the resistance R1 of signal input part, the polar capacitor C1 that positive pole is connected with the normal phase input end of amplifier P, negative pole is connected with capacitive feedback bikini oscillating circuit, the resistance R2 be in parallel with polar capacitor C1, be serially connected in the resistance R4 between the inverting input of amplifier P and output stage, and one end is connected with the inverting input of amplifier P, the resistance R3 of other end ground connection forms; The output stage of described amplifier P is also connected with voltage comparator circuit.
Described voltage comparator circuit is by comparable chip U1, the resistance R6 that one end is connected with the IN2 pin of comparable chip U1, the other end is connected with the V+ pin of comparable chip U1, the resistance R7 that IN2 pin is connected, the other end is then connected with mixting circuit of one end and comparable chip U1, the resistance R5 that one end is connected with the output stage of amplifier P, the other end is then connected with the IN1 pin of comparable chip U1, and the polar capacitor C2 that positive pole is connected with the V-pin of comparable chip U1, negative pole is connected with the GND pin of comparable chip U1 forms; The V+ pin of described comparable chip U1 connects 15V voltage, and its OUT pin is connected with non-same polarity with the Same Name of Ends on the former limit of transformer T1 simultaneously, GND pin ground connection.In order to ensure implementation result, this comparable chip U1 is preferably LM311 integrated chip to realize.
Described mixting circuit is by dual-gate field-effect pipe K, resistance R8, resistance R13, and inductance L 1 forms; One end of resistance R8 is connected with a grid of dual-gate field-effect pipe K, the other end is connected with the IN2 pin of comparable chip U1 after resistance R7, the drain electrode that one end of inductance L 1 is connected with the drain electrode of field effect transistor K, the other end gets back to field effect transistor K after resistance R13; The tie point of resistance R13 and inductance L 1 is connected with the first change-over circuit with treatment circuit simultaneously, the b grid of field effect transistor K is connected with transformer T1 secondary non-same polarity, drain be connected with treatment circuit, source electrode is connected with the first change-over circuit.
Simultaneously, first change-over circuit is by triode Q1, the resistance R9 that one end is connected with the emitter of triode Q1, the other end is connected with the source electrode of dual-gate field-effect pipe K, the polar capacitor C3 be in parallel with resistance R9, the polar capacitor C4 that negative pole is connected with the tie point of inductance L 1 with resistance R13, positive pole is connected with the collector electrode of triode Q1 forms; The base stage of described triode Q1 is connected with the non-same polarity on the former limit of transformer T1, and its emitter is connected with treatment circuit; The emitter of described triode Q1 is also connected with the OUT pin of phase shift chip U2 after potentiometer R15.
Treatment circuit is by triode Q2, triode Q3, the resistance R10 that one end is connected with the base stage of triode Q3, the other end is connected with the emitter of triode Q1, the resistance R11 that one end is connected with the emitter of triode Q3, the other end is connected with emitter and second change-over circuit of triode Q1 simultaneously forms; The base stage of described triode Q3 is connected with the emitter of triode Q2, its collector electrode is connected with the Same Name of Ends on the former limit of transformer T2, emitter is connected with the second change-over circuit, and the base stage of triode Q2 is connected with the tie point of inductance L 1 with resistance R13, its collector electrode is connected with the drain electrode of field effect transistor K and the second change-over circuit simultaneously.
The second described change-over circuit comprises polar capacitor C8, polar capacitor C7, polar capacitor C6, polar capacitor C5, resistance R12, the positive pole of polar capacitor C8 is connected with transformer T2 former limit Same Name of Ends, its negative pole is connected with the collector electrode of triode Q2, the positive pole of polar capacitor C7 is connected with non-same polarity with the Same Name of Ends on the former limit of transformer T2 respectively with negative pole, the positive pole of polar capacitor C6 is connected with the emitter of triode Q3, negative pole is connected with the non-same polarity on the former limit of transformer T2, the positive pole of polar capacitor C5 is connected with the emitter of triode Q1, its negative pole is then connected with the negative pole of polar capacitor C6 after resistance R12, the negative pole of polar capacitor C5 is also connected with the collector electrode of triode Q5.Described transformer T2 secondary Same Name of Ends ground connection, non-same polarity are as signal output part.
Capacitive feedback bikini oscillating circuit can make the frequency of demodulation system more stable, and it is by triode Q6, triode Q7, resistance R18, resistance R19, resistance R20, resistance R21, polar capacitor C12, polar capacitor C13, polar capacitor C14, controllable impedance L2, diode D4, diode D3 and oscillator X form.
During connection, this N pole of diode D3 is connected with the collector electrode of triode Q6, its P pole is then connected with the negative pole of polar capacitor C1, one end of resistance R18 is connected with the P pole of diode D3, its other end is then connected with the base stage of triode Q6, the positive pole of polar capacitor C12 is connected with the collector electrode of triode Q7 after oscillator X, its minus earth, one end of resistance R19 is connected with the emitter of triode Q6, its other end is then connected with the negative pole of polar capacitor C12 after resistance R20, the positive pole of polar capacitor C13 is connected with the emitter of triode Q6, its negative pole is then connected with the collector electrode of triode Q7, controllable impedance L2 is then in parallel with polar capacitor C13, the N pole of diode D4 is connected with the emitter of triode Q6, its P pole is then connected with the negative pole of polar capacitor C12 after resistance R21, the positive pole of polar capacitor C14 is connected with the emitter of triode Q7, its negative pole is then connected with the negative pole of polar capacitor C12.
Meanwhile, connect 15V voltage while the emitter of this triode Q6 is connected with phase-shift circuit, its collector electrode is then connected with the tie point of resistance R20 with resistance R19.The base stage of described triode Q7 is then connected with the collector electrode of triode Q6, its emitter is then connected with the P pole of diode D4.
Wherein, resistance R18 is divider resistance, and it can carry out overvoltage protection to circuit.This triode Q7 is parallel resonance state, and its resonance characteristic then can make oscillator X have stable operating frequency.Resistance R19 and resistance R20 and resistance R21 is then biasing resistor, and the bias current of its adjustable triode Q7 base stage, makes it meet job requirement.Meanwhile, polar capacitor C13 and controllable impedance L2 then forms LC loop, and the oscillation intensity of oscillator X depends on this LC loop, then can regulate the oscillation intensity of oscillator X when regulating controllable impedance L2.In order to reach better implementation result, this triode Q7 can preferably adopt 3DG11B transistor npn npn to realize.
As mentioned above, just well the present invention can be implemented.

Claims (10)

1. based on the phase shift high frequency conversion demodulation system of capacitive feedback bikini oscillating circuit, it is by transformer T1, transformer T2, sample circuit, be connected with sample circuit voltage comparator circuit, the mixting circuit be connected with transformer T1 secondary, the first change-over circuit be connected with mixting circuit, the treatment circuit be simultaneously connected with the first change-over circuit with mixting circuit, the second change-over circuit be connected with treatment circuit output, the phase shift treatment circuit be simultaneously connected with Same Name of Ends and the treatment circuit of transformer T1 secondary forms, the former limit of described transformer T2 is connected with the second change-over circuit, the former limit of transformer T1 is connected with voltage comparator circuit, it is characterized in that: between sample circuit and phase-shift circuit, be also serially connected with capacitive feedback bikini oscillating circuit, described capacitive feedback bikini oscillating circuit is by triode Q6, triode Q7, N pole is connected with the collector electrode of triode Q6, the diode D3 that P pole is then connected with sample circuit, one end is connected with the P pole of diode D3, the resistance R18 that the other end is then connected with the base stage of triode Q6, positive pole is connected with the collector electrode of triode Q7 after oscillator X, the polar capacitor C12 of minus earth, one end is connected with the emitter of triode Q6, the resistance R19 that the other end is then connected with the negative pole of polar capacitor C12 after resistance R20, positive pole is connected with the emitter of triode Q6, the polar capacitor C13 that negative pole is then connected with the collector electrode of triode Q7, the controllable impedance L2 be in parallel with polar capacitor C13, N pole is connected with the emitter of triode Q6, the diode D4 that P pole is then connected with the negative pole of polar capacitor C12 after resistance R21, and positive pole is connected with the emitter of triode Q7, the polar capacitor C14 that negative pole is then connected with the negative pole of polar capacitor C12 forms, connect 15V voltage while the emitter of described triode Q6 is connected with phase-shift circuit, its collector electrode is then connected with the tie point of resistance R20 with resistance R19, the base stage of described triode Q7 is then connected with the collector electrode of triode Q6, its emitter is then connected with the P pole of diode D4.
2. the phase shift high frequency conversion demodulation system based on capacitive feedback bikini oscillating circuit according to claim 1, it is characterized in that: described phase shift treatment circuit is by phase shift chip U2, triode Q4, triode Q5, one end is connected with the VCC+ pin of phase shift chip U2, the resistance R16 that the other end is connected with the IN1 pin of phase shift chip U2, negative pole is connected with the IN1 pin of phase shift chip U2 after resistance R17, the polar capacitor C11 that positive pole is connected with the IN2 pin of phase shift chip U2, positive pole is connected with the NC pin of phase shift chip U2 after resistance R14, the polar capacitor C9 that negative pole is connected with the collector electrode of triode Q4, positive pole is connected with the OUT pin of phase shift chip U2, the polar capacitor C10 of minus earth, one end is connected with the OUT pin of phase shift chip U2, the potentiometer R15 that the other end is connected with treatment circuit, P pole is connected with the OFF1 pin of phase shift chip U2, the diode D1 that N pole is connected with the base stage of triode Q4, and P pole is connected with the OFF2 pin of phase shift chip U2, the diode D2 that N pole is connected with the emitter of triode Q5 forms, the VCC+ pin of described phase shift chip U2 is connected with the Same Name of Ends of transformer T1 secondary, its VCC-pin ground connection, its OUT pin are connected with the sliding end of potentiometer R15, the emitter of triode Q4 is connected with the base stage of triode Q5, and the collector electrode of triode Q5 is then connected with the second change-over circuit, the negative pole of described polar capacitor C11 is also connected with the emitter of triode Q6.
3. the phase shift high frequency conversion demodulation system based on capacitive feedback bikini oscillating circuit according to claim 2, it is characterized in that: described sample circuit is by amplifier P, one end is connected with the normal phase input end of amplifier P, the other end is as the resistance R1 of signal input part, positive pole is connected with the normal phase input end of amplifier P, the polar capacitor C1 that negative pole is then connected with the P pole of diode D3, the resistance R2 be in parallel with polar capacitor C1, be serially connected in the resistance R4 between the inverting input of amplifier P and output, and one end is connected with the inverting input of amplifier P, the resistance R3 of other end ground connection forms, the output stage of described amplifier P is also connected with voltage comparator circuit.
4. the phase shift high frequency conversion demodulation system based on capacitive feedback bikini oscillating circuit according to claim 3, it is characterized in that: described voltage comparator circuit is by comparable chip U1, one end is connected with the IN2 pin of comparable chip U1, the resistance R6 that the other end is connected with the V+ pin of comparable chip U1, one end is connected with the IN2 pin of comparable chip U1, the resistance R7 that the other end is then connected with mixting circuit, one end is connected with the output of amplifier P, the resistance R5 that the other end is then connected with the IN1 pin of comparable chip U1, and positive pole is connected with the V-pin of comparable chip U1, the polar capacitor C2 that negative pole is connected with the GND pin of comparable chip U1 forms, the V+ pin of described comparable chip U1 connects 15V voltage, and its OUT pin is connected with non-same polarity with the Same Name of Ends on the former limit of transformer T1 simultaneously, GND pin ground connection.
5. the phase shift high frequency conversion demodulation system based on capacitive feedback bikini oscillating circuit according to claim 4, is characterized in that: described mixting circuit is by dual-gate field-effect pipe K, resistance R8, resistance R13, and inductance L 1 forms; One end of resistance R8 is connected with a grid of dual-gate field-effect pipe K, the other end is connected with the IN2 pin of comparable chip U1 after resistance R7, the drain electrode that one end of inductance L 1 is connected with the drain electrode of field effect transistor K, the other end gets back to field effect transistor K after resistance R13; The tie point of described resistance R13 and inductance L 1 is connected with the first change-over circuit with treatment circuit simultaneously, the b grid of field effect transistor K is connected with transformer T1 secondary non-same polarity, drain be connected with treatment circuit, source electrode is connected with the first change-over circuit.
6. the phase shift high frequency conversion demodulation system based on capacitive feedback bikini oscillating circuit according to claim 5, it is characterized in that: the first described change-over circuit is by triode Q1, the resistance R9 that one end is connected with the emitter of triode Q1, the other end is connected with the source electrode of dual-gate field-effect pipe K, the polar capacitor C3 be in parallel with resistance R9, the polar capacitor C4 that negative pole is connected with the tie point of inductance L 1 with resistance R13, positive pole is connected with the collector electrode of triode Q1 forms; The base stage of described triode Q1 is connected with the non-same polarity on the former limit of transformer T1, and its emitter is connected with treatment circuit; The emitter of described triode Q1 is also connected with the OUT pin of phase shift chip U2 after potentiometer R15.
7. the phase shift high frequency conversion demodulation system based on capacitive feedback bikini oscillating circuit according to claim 6, it is characterized in that: described treatment circuit is by triode Q2, triode Q3, the resistance R10 that one end is connected with the base stage of triode Q3, the other end is connected with the emitter of triode Q1, the resistance R11 that one end is connected with the emitter of triode Q3, the other end is connected with emitter and second change-over circuit of triode Q1 simultaneously forms; The base stage of described triode Q3 is connected with the emitter of triode Q2, its collector electrode is connected with the Same Name of Ends on the former limit of transformer T2, emitter is connected with the second change-over circuit, and the base stage of triode Q2 is connected with the tie point of inductance L 1 with resistance R13, its collector electrode is connected with the drain electrode of field effect transistor K and the second change-over circuit simultaneously.
8. the phase shift high frequency conversion demodulation system based on capacitive feedback bikini oscillating circuit according to claim 7, is characterized in that: the second described change-over circuit comprises polar capacitor C8, polar capacitor C7, polar capacitor C6, polar capacitor C5, resistance R12, the positive pole of polar capacitor C8 is connected with transformer T2 former limit Same Name of Ends, its negative pole is connected with the collector electrode of triode Q2, the positive pole of polar capacitor C7 is connected with non-same polarity with the Same Name of Ends on the former limit of transformer T2 respectively with negative pole, the positive pole of polar capacitor C6 is connected with the emitter of triode Q3, negative pole is connected with the non-same polarity on the former limit of transformer T2, the positive pole of polar capacitor C5 is connected with the emitter of triode Q1, its negative pole is then connected with the negative pole of polar capacitor C6 after resistance R12, the negative pole of polar capacitor C5 is also connected with the collector electrode of triode Q5.Described transformer T2 secondary Same Name of Ends ground connection, non-same polarity are as signal output part.
9. the phase shift high frequency conversion demodulation system based on capacitive feedback bikini oscillating circuit according to claim 8, is characterized in that: described comparable chip U1 is LM311 integrated chip.
10. the phase shift high frequency conversion demodulation system based on capacitive feedback bikini oscillating circuit according to claim 8, is characterized in that: described phase shift chip U2 is preferably LM741 integrated chip.
CN201510307192.5A 2014-11-26 2015-06-06 Phase shift type high-frequency transformation demodulation system based on capacitance feedback three-point type oscillation circuit Pending CN104852593A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN201410692727.0A CN104407379A (en) 2014-11-26 2014-11-26 Phase processing based high-frequency-transformation detection system
CN2014106927270 2014-11-26
CN201510307192.5A CN104852593A (en) 2014-11-26 2015-06-06 Phase shift type high-frequency transformation demodulation system based on capacitance feedback three-point type oscillation circuit

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CN104407379A (en) * 2014-11-26 2015-03-11 成都创图科技有限公司 Phase processing based high-frequency-transformation detection system
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CN102620375A (en) * 2012-04-25 2012-08-01 黄宇嵩 Ultrasonic humidifier
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CN2455703Y (en) * 2000-12-01 2001-10-24 沈家明 Electronic water processor
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CN104407379A (en) * 2014-11-26 2015-03-11 成都创图科技有限公司 Phase processing based high-frequency-transformation detection system

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Application publication date: 20150819